两种中口径弹药弹带动态挤进阻力特性的实验研究

针对弹丸挤进过程中弹带在坡膛产生高应变率塑性变形及断裂问题,采用短管炮发射装置完成了两种不同弹带动态挤进过程的阻力特性实验。采用动态压力测量和高速录像系统进行了挤进过程中膛内火药燃气的压力和弹丸位移数据的测量。对膛内压力和位移数据进行计算,得到了弹带挤进变形期间的阻力特性曲线。研究结果表明,弹带材料和结构对挤进阻力的影响较为明显,紫铜弹带相对于尼龙弹带有较高的挤进启动压力和最大阻力值,相应的挤进时间较短。

Experimental Study on Engraving Resistance Properties of Bandof Two Medium Caliber Projectile

In the engraving process of projectile,the plastic deformation with high strain-rate and fracture of projectile band happen at the bullet ramp. Aiming at this problem,the engraving resistance properties of two different projectile bands were studied in a short barrel launching device and data acquisition system. The dynamic pressure testing system and high-speed video recording system were used to measure the pressure of combustion gas and the displacements of projectile at the same time. The pressure and displacement data in the bore were calculated,and the engraving force profiles during the deformation of band materials were obtained. The results indicate that the effect of material and structure of band on engraving resistance is obvious,and the copper band has higher initial deforming pressure and maximum force than the nylon band,and the corresponding engraving time is shorter.